April 21
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- 1973: Katsuyuki Konishi (Japanese voice of Energon Optimus Prime and Cliffjumper) is born.
- 1988: The Super-God Masterforce OP/ED single "Chōjin Masterforce no Theme"/"Moero! Transformer" is released in Japan by Columbia Music Entertainment.
- 1996: The Beast Wars episode "Beast Wars (Part 2)" premieres in the US.
- 1999: The Beast Wars Neo episode "Lonely Hydra" premieres in Japan.
- 1999: The Beast Wars Neo ED single "Te no Naka no Uchū" is released in Japan by Columbia Music Entertainment.
- 2004: The Transformers — Collection 2: Series 2.1 is released on DVD in Australia by Madman Entertainment.
- 2004: The Zone OVA "Enter the New Supreme Commander, Dai Atlas!" is released on DVD in Japan by Columbia Music Entertainment.
- 2005: The Galaxy Force — Sound Pack 1 soundtrack album is released in Japan by Victor Entertainment.
- 2006: Galaxy Force — Vol. 11 is released on DVD in Japan by Victor Entertainment.
- 2010: Last Stand of the Wreckers #4 and Spotlight: Prowl are released in the US by IDW Publishing.
- 2010: The Transformers Animated OP single "TRANSFORMERS EVO." is released in Japan by Lantis.

